broken pmbr?

I just managed to, um, break my installation boot using these steps:

1. system with at least two disks (say ad0 and ad4)
2. create gpt partition on ad0
3. create at least one freebsd-ufs on ad0
4. install freebsd on ad4 using gpt ( http://m8d.de/news/freebsd-on-gpt.php )
5. reboot and boot to ad4
6. 'Missing boot loader'

(Rearranging ad0 to adX where X>4 or removing ad0 solves the problem, btw)

Does pmbr only search first drive with gpt it found?

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